Om Materialprøvningens Udvikling i Norden
Og om Statsprøveanstaltens Virksomhed

185 reaches in underneath the left end of the foundation - slab of the hammer-apparatus, and with its horn A it supports V at a distance of 16 cm from the left end of V. The usual ham- mer is replaced by one the falling weight of which is only 1 kg. The breadth of the lever-prop, at right angles with I he plan of the paper, is 15 cm, its weight being 51,5 kg. B is the burner on which the incandescent mantle is fastened, and the number of strokes required up to the time when the net is Lorn to pieces and tumbles down, is counted. To be able to shake the incandescent mantle in vertical direction instead of ho- rizontally there is also a hole in the lever-prop in the place de- signated with a dotted line for the application of a gas-burner. The test is made when the net is cold. The figure also shows how Bohme’s hammer is adapted to driving with belt-pulling the belt being placed round the pulley R. On adding the lever U and the weight P it is obtained that the belt springs off after 150 strokes. To examine the resistance of china-plates to blows Ihe La- boratory has employed a variation of She apparatus shown in p. 25 in fig. 8. The plate is clasped at an angle of 45° and hit by strokes from a one-armed lever at the top of and near the end of which an iron hoop keeps the lever in a sloping position on the iron hanging at the electro-magnet E in fig. 8. Each plate is tested in several places of the circumference. Any special ex- perience has not yet been obtained with this apparatus. QH9